If you wish to keep your source code private, you must purchase a commercial license from iText PDF. Important: Security Considerations
iText 5.5.12 is a maintenance release of the legacy iText 5 PDF library, first launched in August 2017. While the iText 5 product line has since reached and transitioned to maintenance mode for security updates only, version 5.5.12 remains a common requirement for maintaining legacy Java and .NET (iTextSharp) applications. Where to Download iText 5.5.12 itext 5.5.12 download
For .NET projects, iTextSharp 5.5.12 is available on NuGet . Maven Dependency Configuration If you wish to keep your source code